You should read the article he's posted, particularly page 2 where there's a comparison between the gamut of colours displayable by the monitors for the 13", 15" and 17" MBP vs sRGB. You'll see that there is very little difference. This was actually measured using a colorimeter.

This makes me doubt the original article as it makes no mention of how the author knows that the MBP 13" displays only thousands of colours.